const createError = require("http-errors");
const express = require("express");
const path = require("path");
const cookieParser = require("cookie-parser");
const logger = require("morgan");
const fs = require("fs");

require("./data/db");

const app = express();
app.all("*", function (req, res, next) {
  //设置允许跨域的域名，*代表允许任意域名跨域
  res.header("Access-Control-Allow-Origin", "*");
  //允许的header类型
  res.header("Access-Control-Allow-Headers", "content-type,Authorization,user");
  //跨域允许的请求方式
  res.header("Access-Control-Allow-Methods", "DELETE,PUT,POST,GET,OPTIONS");
  if (req.method.toLowerCase() == "options") res.sendStatus(200);
  //让options尝试请求快速结束
  else next();
});

// view engine setup

app.use(logger("dev"));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, "public")));
app.use("/api", express.static(path.join(__dirname, "doc"))); // TODO 上线时关闭 apidoc -i routes/ -o doc/

const ejs = require("ejs");

ejs.delimiter = "`";
app.set("views", path.join(__dirname, "views"));
app.engine(".html", ejs.__express);
app.set("view engine", "html");

const routes = fs.readdirSync(path.join(__dirname, "routes"));
routes.forEach(v => {
  let rout = v.replace(".js", "");
  app.use(`/${rout}`, require(`./routes/${rout}`)); //以文件名为接口
});

app.get("/", (req, res) => {
  // 渲染首页
  res.render("index", { title: "首页" });
});

// catch 404 and forward to error handler
app.use((req, res, next) => {
  next(createError(404));
});

// error handler
app.use((err, req, res, next) => {
  // set locals, only providing error in development
  res.locals.message = err.message;
  res.locals.error = req.app.get("env") === "development" ? err : {};

  // render the error page
  res.status(err.status || 500);
  res.render("error");
});

module.exports = app;
